How many wheels does a semi truck have

A semi truck, also known as a eighteen-wheeler in the USA or a lorry or prime mover in the Commonwealth of Nations, is a large motor vehicle designed to transport cargo. Most semis are painted with colorful and sometimes complex designs that cover the truck – now you know about Semi Truck. Trucks are developed to support a lot of weight on rough terrains and longer routes. They are built with large wheels that can tackle any kind of road especially the bumpy ones. The size of the wheels is directly proportional to the truck’s weight bearing capacity, and you need bigger wheels to move bigger weight. A tractor truck has eight wheels, and each wheel is powered by its own engine.

wheels does a semi truck have

A semi-truck has six wheels. The front two are steerable and the rear four are drive wheels, which are powered by the engine.

The steering axle is at the front of the truck, where it can swivel to make turns. In the middle of the vehicle is a rigid structural frame, often called a “cab over” design because it places the driver’s cab above the engine. The rear axle is called a drive axle because it carries power to all four wheels.

Semi-trucks have three different types of tires:

  • steerable front tires that control direction
  • drive wheels that support weight and provide traction for acceleration and stopping
  • rear trailer tires that allow for tight turns on small roads

10 wheels to make a semi truck

The fifth wheel is attached to the trailer and is used to steer the trailer from the cab of the truck. The sixth wheel is found on trucks that are designed to tow other vehicles. The seventh wheel helps support the weight of the vehicle. Both the eighth and ninth wheels keep axles at the same height. The tenth wheel helps transport heavy loads on uneven terrain by allowing it to tilt up or down as needed

How many tires are on a semi truck

The answer to the question “How many wheels does a semi truck have?” is that there are two sets of wheels on a semi truck.

The tractor unit is equipped with four tires, while the trailer has two tires.

Each of these tires has its own air supply. They require separate air tanks to maintain pressure in the tire. The purpose of the air pressure is to support the weight of the vehicle and carry it over rough terrain.

Semi truck tires cost

Semis have dual wheels on the rear axles. Semi trucks use a variety of tire types, depending on the application.

Semi truck tires are typically 11R22.5 or 12R22.5, with the R standing for radial and the 22.5 representing the diameter in inches (and sometimes the width in millimeters).

Semi truck tires can cost $700-$1,500 each, depending on their size and quality. This is an increase from $100-$300 per tire several decades ago due to inflation and improved technology that allows for greater weight capacity on each truck tire.

Driving semi truck is not easy

The number of wheels on a semi truck can vary. The most common configuration is four tires in the front and two in the back, with one axle on each side. That’s called a tandem drive train.

Semi trucks’ wheels can also be arranged in a tridem drive train, with three axles on the outside and one in the center; or a quad-axle drive train, with four axles on the outside.

There are also semi trailers that have more than two axles: tandem-trailer configurations have three axles per trailer. Tridem-trailer configurations have four or six axles per trailer.

There are ten wheels on a semi which makes the total of eighteen wheels

The semi-truck has ten wheels on the front and eight on the rear. The front axle has four tires and the rear axle has three tires. Each tire is made up of two wheels. Therefore, eighteen wheels comprise a semi-truck.

A semi-trailer may be pulled by a single axle or by two axles, which is referred to as tandem. The maximum number of trailers that can be pulled is three and they are called triple trailer rigs.

A typical semi truck

A typical semi truck has eighteen or more tires, including ten on the drive axles, and four on the steering axle.

The most common size for a semi truck tire is 22.5” x 11R, which is large enough to support the weight of a fully loaded truck. Semi trucks often use special low-profile tires that allow them to drive over rough terrain without getting stuck or damaging their suspensions.

Semi trucks also come with dual rear wheels and suspension systems that are designed to handle heavy loads and rough roads.

A semi truck has 18 wheels

Each axle has two wheels on it. There are also two steerable front wheels, which allow the driver to turn the truck.

The total number of wheels on a semi truck is 18 because there are three axles on each side of the vehicle. In addition to these 18 wheels, the trailer that is attached to the semi truck has its own set of 12 wheels (six wheels per axle).


So, if you are passionate to drive a truck transport, then there will be a lot of responsibilities in your life. These responsibilities or jobs may include driving the vehicle as you want and deliver material on time. So, the best way to drive according to the truck rules is Semi Truck Steering.  The concept of this practice is very easy which you can learn by reading this content easily. So, if you really want to learn it then see the description below.